Text in Notes Section Randomly (and Consistently) Disappears

While typing notes in the notes section of Zotero, entire lines of newly typed text will a deleted and the cursor will appear at the top of the notes window. Text seems to be preserved by hitting enter, which moves the cursor to a new line, and then pressing back space to return the cursor the end of the newly typed line of text (in case this information helps identify the source of the problem).

Please help. Zotero is basically unusable with this glitch.
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